下列结构类型中可以用水蒸气蒸馏法提取的是（）
A.黄酮
B.蒽醌
C.小分子苯醌和萘醌
D.三萜
E.甾体
参考答案：C
The train when we to the station. [ ]
A. was left; was getting
B. left; had got
C. had left; got
D. left; got
He insisted that he _____ the best, so he insisted that he _____ the work all by himself.
A．was; do
B．be; do
C．be; did
D．had been; had done
